@keyframes breathe {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }

  50% {
    opacity: 1;
    transform: scale(1.2);
  }

  100% {
    opacity: 0.5;
    transform: scale(1);
  }
}

.breathing-light {
  /* ease-in-out：渐显渐隐效果（很慢-慢-快-慢-很慢） */
  animation: breathe 3s ease-in-out infinite;
  animation-delay: 1s;
}